Excellent brave truth-telling by Martina Navratilova. She’s said nothing transphobic she’s been thoughtful and kind in this article and is informed.
She’s rightly drawn boundaries to protect all of women’s sport over the validation and unfair advantage some are insisting on. So she’s calling out unfairness and drawing attention to this clash of rights. No phobia involved there. It’s very brave and good of her to speak out - thank you to her 
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‘Ever the peacemaker, I promised to keep quiet on the subject until I had properly researched it.
Well, I’ve now done that and, if anything, my views have strengthened. To put the argument at its most basic: a man can decide to be female, take hormones if required by whatever sporting organisation is concerned, win everything in sight and perhaps earn a small fortune, and then reverse his decision and go back to making babies if he so desires. It’s insane and it’s cheating. I am happy to address a transgender woman in whatever form she prefers, but I would not be happy to compete against her. It would not be fair.
Simply reducing hormone levels — the prescription most sports have adopted — does not solve the problem. A man builds up muscle and bone density, as well as a greater number of oxygen-carrying red blood cells, from childhood. Training increases the discrepancy. Indeed, if a male were to change gender in such a way as to eliminate any accumulated advantage, he would have to begin hormone treatment before puberty. For me, that is unthinkable.’